amd/iommu: Fix Guest Virtual APIC Log Tail Address Register

This register should have been programmed with the physical address
of the memory location containing the shadow tail pointer for
the guest virtual APIC log instead of the base address.

Fixes: 8bda0cfb  ('iommu/amd: Detect and initialize guest vAPIC log')
Signed-off-by: NFilippo Sironi <sironi@amazon.de>
Signed-off-by: NWei Wang <wawei@amazon.de>
Signed-off-by: NSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

drivers/iommu/amd_iommu_init.c

@@ -797,7 +797,8 @@ static int iommu_init_ga_log(struct amd_iommu *iommu)
 	entry = iommu_virt_to_phys(iommu->ga_log) | GA_LOG_SIZE_512;
 	memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_BASE_OFFSET,
 		    &entry, sizeof(entry));
-	entry = (iommu_virt_to_phys(iommu->ga_log) & 0xFFFFFFFFFFFFFULL) & ~7ULL;
+	entry = (iommu_virt_to_phys(iommu->ga_log_tail) &
+		 (BIT_ULL(52)-1)) & ~7ULL;
 	memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_TAIL_OFFSET,
 		    &entry, sizeof(entry));
 	writel(0x00, iommu->mmio_base + MMIO_GA_HEAD_OFFSET);